Picture frame



FIG. 1 is a front perspective view of a picture frame showing my new design;

FIG. 2 is a front elevational view thereof, shown fragmented for ease of illustration;

FIG. 3 is a rear elevational view thereof, shown fragmented for ease of illustration;

FIG. 4 is a right-side view, shown fragmented for ease of illustration, the left side being a mirror image thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for the picture frame, as shown and described. 